Leighford High's Head of Sixth Form, Peter Maxwell, has a complete aversion to technology. Computers and mobile phones, texts and emails; these are not things that 'dinosaur' Mad Max wants to know about. However, it soon becomes of vital importance that he learns when some of his female pupils start receiving strange and threatening messages, from an unknown sender who claims to know intimate details about the girls' personal lives. Then Max starts receiving them too, and two of the girls go missing. When a body is found it seems that the prank has taken a sinister turn. With threats to his own life, will Max manage to solve the case and reach his retirement?